[PATCH 00/21] Qualcomm generic board support

[Sumit Garg]

Hi Tom,

On Sun, 10 Dec 2023 at 03:33, Tom Rini <trini at konsulko.com> wrote:
>
> On Mon, Dec 04, 2023 at 11:02:57AM +0530, Sumit Garg wrote:
>
> [snip]
> > But currently u-boot doesn't have a proper way to validate those DTS
> > against DT bindings (maintained in Linux kernel). Although there are
> > Devicetree schema tools available here [2], there isn't a versioned
> > release package of DT bindings which one should use to validate DTS
> > files.
>
> I will have more / other things to say but I want to chime in here. That
> U-Boot cannot validate the DTS files is a bug, not a feature. I would
> very much appreciate if someone(s) with time and skills to do so would
> re-sync us with the kernel Kbuild again so that we can both stay in sync
> again and have the validation targets / functionality available here
> too.
>

Agree, the Kbuild changes to add dtbs_check was the first thing I
implemented after importing devicetree-rebasing repo in u-boot (see
commit [1] for details). Usage with PR [2] included:

While building any u-boot target, just add make target: "dtbs_check"
and you will see the DT schema checks being performed. Steps:

$ make <target>_defconfig
$ make -j`nproc` dtbs_check

Currently there are a lot of incompatibility warnings I have seen for
the platforms I built. This shows how much difficult it has been to
keep DT in sync with upstream DT bindings.

TBH, this was the only motivation for me to get into discussion with
DT bindings maintainers for a separate repo. But since with
devicetree-rebasing, we get devictree files bundled along and then I
got into reusing them for building DTBs in u-boot. This has the other
benefit of reducing maintainer's pain to keep DT in sync with Linux
kernel major releases (see amlogic platforms to be the first migrator
[3]).

[1] https://github.com/u-boot/u-boot/pull/451/commits/7ea2dc2477992a603fa881d0da563246ee2f02d9
[2] https://github.com/u-boot/u-boot/pull/451
[3] https://github.com/u-boot/u-boot/pull/451/commits/38c2ac62e9134604d1a56179d57baa1877712b3e

-Sumit

> --
> Tom